The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X85-40S is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end by up to 40 mm. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at 0.9 MPa, making it a solid mid-range actuator for tasks that need on-machine stroke trimming.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG sensors clamp directly onto the barrel for reliable end-of-stroke or mid-position sensing. The adjustable cushion decelerates the piston over 28 mm at each end, and the body length A(SCJ) is 197 mm — slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 85 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 28 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×85 | Nominal (maximum) stroke length in mm. |
| -40 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
During machine bring-up, the 40 mm adjusting screw lets technicians tweak the end-stop position in seconds without re-plumbing or replacing the cylinder, speeding up the debug cycle.
On packaging or filling lines that run multiple product sizes, the adjustable stroke allows operators to set a new push or retract limit for different box heights or container shapes with a simple screw adjustment.
In high-cycle clamping or pressing fixtures, the stroke-end screw can be advanced periodically to compensate for tooling wear or seal compression, maintaining consistent part contact without reprogramming the PLC.
Choose the SCJ63X85-40S when you need to dial in the stroke end during commissioning, format changeovers, or to take up mechanical wear without swapping the cylinder. If 1559 N of push at 0.5 MPa is too light, step up to the 80 mm bore (2513 N push); if it is more force than you need, the 50 mm bore provides 982 N. For applications where the stroke is fixed and never adjusted, a standard SC63X85-S with the same magnet option is a simpler, lower-cost alternative.
A direct replacement must match the 63 mm bore, 85 mm nominal stroke, 40 mm adjustable range, PT ports, and the built-in magnet. The SCJ mounting subset includes basic, FA front flange, LB foot, and TC centre trunnion — no FB flange or clevis mounts are available. For strokes of 85 mm, side-loading is generally manageable, but always align the rod with the load axis to prevent premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa air pressure, the cylinder produces 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 1.0 MPa, push force reaches 3117 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the retract side.
You can if you need the 40 mm stroke-end adjustability and the built-in magnet. The SCJ body is slightly longer (197 mm A-length) to accommodate the rear screw. Ensure the mounting style, port thread (PT), and sensor compatibility match your existing setup. If you do not need the adjustable feature, the SC63X85-S is a direct dimensional drop-in.
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